Battery assembly

ABSTRACT

A battery assembly for a vehicle or other equipment including at least one battery module having a pair of battery terminals with a distance therebetween, and a housing assembly including a receiver defining a receptacle for receiving the battery module and a pair of battery terminals. The distance between the battery terminals of the housing assembly is greater than the distance between the battery terminals of the battery module. The distance between the battery terminals of the housing assembly may be the same as the distance between the battery terminals of a standard battery. The exterior dimensions of the housing assembly may be the same as the exterior dimensions of a standard battery. The said at least one battery module may be multiple battery modules where they may be connected to each other in parallel or in series or, a combination of both.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a Continuation-in-Part of copending U.S. applicationSer. No. 16/027,832, filed Jul. 5, 2018, the contents of which areincorporated herein by reference in their entirety.

The present disclosure relates to a battery assembly for a vehicle orother equipment.

BACKGROUND

Automobiles and other vehicles and equipment typically are designed witha certain standard battery size in mind. During the design, theclearances around and above the battery, the battery tray, the method ofsecuring the battery, the positive and negative lead lengths typicallyare all predetermined based on such certain standard battery size. As aresult, battery modules that do not have such standard battery sizetypically cannot be used with such equipment.

SUMMARY

The present disclosure relates to a battery assembly for a vehicle orother equipment comprising at least one battery module having a firstpositive battery terminal and a first negative battery terminal and adistance therebetween. The battery assembly further comprises a housingassembly that includes a receiver defining a receptacle for receivingthe battery module and a second positive battery terminal and a secondnegative battery terminal. The distance between the second positivebattery terminal and the second negative battery terminal is greaterthan the distance between the first positive battery terminal and thefirst negative battery terminal. The battery assembly further comprisesa first electrical connector for interconnecting the first positivebattery terminal and the second positive battery terminal, and a secondelectrical connector for interconnecting the first negative batteryterminal and the second negative battery terminal. The distance betweenthe second positive battery terminal and the second negative batteryterminal may be the same as the distance between a positive batteryterminal and a negative battery terminal of a standard battery. The saidat least one battery module may be a single battery module or multiplebattery modules. Where there are two battery modules, the batterymodules may be connected to each other in parallel or in series and,where there are three or more battery modules, the battery modules maybe connected to each other in parallel or series or a combination ofboth.

The housing assembly of the battery assembly may also include a lid forenclosing the receptacle. The exterior dimensions, length, width andheight of the housing assembly when assembled may be the same or nearlythe same as the exterior dimensions of a standard battery.

The housing assembly of the battery assembly may include one or morepartitions, receivable in the receptacle for holding the battery modulein place within the receptacle, and engaging structure for engaging thereceiver and the partition. For example, the receiver may define a pairof opposed walls with the engaging structure formed on the walls thatmay define at least one slot for receivingly engaging the partition.

The housing assembly of the battery assembly may also comprise anextension engaged with the receiver. The extension defines an aperturefor receiving either the second positive battery terminal or the secondnegative battery terminal. The extension may be slidably engaged withthe receiver. For example, the receiver may include a wall having anoutside that defines a slot and the extension includes an embossmentslidingly receivable within the slot. The extension may define anaperture for receiving the terminal cable.

Features and advantages of the disclosure will be set forth in part inthe description which follows and the accompanying drawings describedbelow, wherein an embodiment of the disclosure is described and shown,and in part will become apparent upon examination of the followingdetailed description taken in conjunction with the accompanyingdrawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of a housing assembly of a battery assemblyin accordance with an embodiment of the present disclosure;

FIG. 2 is an exploded view of the battery assembly of FIG. 1 alsoillustrating the battery modules contained in the housing assembly;

FIG. 3 is a perspective view of a housing assembly of a battery assemblyin accordance with another embodiment of the present disclosure;

FIG. 4 is a partially exploded view of the battery assembly of FIG. 3also illustrating the battery modules contained in the housing assembly;

FIG. 5 is another partially exploded view of the battery assembly ofFIG. 3;

FIG. 6 is a perspective view of the extension and the negative batteryterminal of the battery assembly of FIG. 3;

FIG. 7 is a perspective view of a housing assembly of a battery assemblyin accordance with another embodiment of the present disclosure;

FIG. 8 is a partially exploded view of the battery assembly of FIG. 7also illustrating the battery modules contained in the housing assembly;

FIG. 9 is another partially exploded view of the battery assembly ofFIG. 7 from another perspective also illustrating the battery modulescontained in the housing assembly; and

FIG. 10 is a perspective view of the extension and the negative batteryterminal of the housing assembly of FIG. 7.

DETAILED DESCRIPTION

FIGS. 1-10 illustrate three embodiments of a battery assembly 8, 108 and208 including a housing assembly 10, 110 and 210, respectively, for abattery module. Each housing assembly 10, 110 and 210 includes a batterymodule for installation of the battery module in a vehicle or otherequipment designed to employ a specific battery size even though thebattery module to be installed is sized differently from the specificbattery size intended for the vehicle or other equipment.

With reference to FIGS. 1-2, the housing assembly 10 includes a receiver12 that defines a receptacle 14 receiving a pair of battery modules 16,one or more partitions 18, a first electrical connector in the form of apositive terminal busbar 22, a second electrical connector in the formof a negative terminal busbar 24, a positive battery terminal 26, anegative battery terminal 28 and a lid 32 that encloses the top of thereceptacle 14. The lid 32 defines a pair of apertures 36 and 38 forreceiving the positive battery terminal 26 and the negative batteryterminal 28. The lid 32 also may include a handle.

The battery modules 16 may be of any suitable size configured to bereceived within the receptacle 14 and may instead be a single batterymodule or multiple battery modules. Each battery module 16 includes apositive battery terminal 44 and a negative battery terminal 46. Wherethere are two battery modules 16, the battery modules may be connectedto each other in parallel as illustrated on FIG. 2 or in series and,where there are three or more battery modules, the battery modules maybe connected to each other in parallel or series or a combination ofboth.

The positive terminal busbar 22 interconnects the positive batteryterminal 44 of at least one of the battery modules 16 with the positivebattery terminal 26 of the housing assembly 10. The positive terminalbusbar 22 is connected and secured to at least one of the positivebattery terminals 44 of the battery modules 16 by one or more buttonscrews or by any other suitable joining method. The positive terminalbusbar 22 is connected and secured to the positive battery terminal 26of the housing assembly 10 by a button screw or any other suitablejoining method. The positive terminal busbar 22 instead may be any othersuitable electrical connector such as a cable, a bar or other suitableconnector or combination of any of the foregoing.

The negative terminal busbar 24 interconnects the negative batteryterminal 46 of at least one of the battery modules 16 with the negativebattery terminal 28. The negative terminal busbar 24 is connected andsecured to at least one of the negative battery terminals 46 of thebattery modules 16 by one or more button screws or by any other suitablejoining method. The negative terminal busbar 24 is connected and securedto the negative battery terminal 28 by a button screw or by any othersuitable joining method. The negative terminal busbar 24 instead may beany other suitable electrical connector such as a cable, a bar or othersuitable connector or a combination of any of the foregoing.

The partition 18 is received by the receptacle 14 and is positioned nextto the battery modules 16 to limit or eliminate movement of the batterymodules within the receptacle or for otherwise holding the batterymodules in place. The illustrated partition 18 is in the form of a framewith side rails, top and bottom rails, and a rail interconnecting theside rails. The partition 18 may have any other configuration thatcomplements the side of the battery modules 16. The receiver 12 includestwo pairs of opposed walls 54 and 56. The receiver 12 includes engagingstructure for engaging the partition 18. In the illustrated embodiment,for example, the engaging structure defines a pair of opposed slots 64on the opposed walls 54 for slidingly engaging the partition 18. Thelocation of the slots 64 depends upon the sizes of the battery modules16 received within the receptacle 14. The engaging structure may be inany other suitable form and, in accordance with other embodiments,provide alternative locations for the partition 18 for adjustablypositioning the partition 18 at the suitable location.

The receiver 12 may incorporate up to four hold-down brackets 65. One oneach side. They may be removable as illustrated on FIG. 2. The receiver12 may be secured to the vehicle in any other suitable manner inaccordance with other embodiments of the present disclosure.

The receiver 12, the partition 18, the lid 32 and the detachablehold-down brackets may be constructed of plastic or any other suitablematerial and may have any suitable configuration. The first and secondelectrical connectors may be constructed of metal or any other suitablematerial and may have any suitable configuration.

The distance between the positive battery terminal 26 and negativebattery terminal 28 of the housing assembly 10 depends upon the vehicleand the size of the battery the vehicle was designed to accommodate. Forexample, the distance between positive and negative battery terminals ofa standard 8.2″ battery is about 6″. For example, if the vehicle wasintended for use with such a standard 8.2″ battery, the distance betweenthe positive and negative battery terminals of the housing assemblywould be about 6″. The housing assembly 10 can be used with batterymodules 16 having a distance between the positive and negative terminals44 and 46 of the battery modules that is less than the distance betweenthe positive battery terminal 26 and the negative battery terminal 28 ofthe housing assembly. By turning the battery modules 180° in thereceptacle, the polarity of terminals 26 and 28 in the housing assembly10 may be reversed.

With reference to FIGS. 3-6, the housing assembly 110 includes areceiver 112 that defines a receptacle 114 receiving a pair of batterymodules 116, one or more partitions 118, a first electrical connector inthe form of a positive terminal busbar 122, a second electricalconnector in the form of negative terminal busbar 124 and terminal cable120, a positive battery terminal 126, a negative battery terminal 128,an extension 130 and a lid 132 that encloses the top of the receptacle114. The lid 132 defines an aperture 136 for receiving the positivebattery terminal 126. The lid 132 also may include a handle 134. The lid132 may also include a battery terminal lid 138 to enclose the positivebattery terminal 126.

The battery modules 116 may be of any suitable size configured to bereceived within the receptacle 114 and may instead be a single batterymodule or multiple battery modules. Each battery module 116 includes apositive battery terminal and a negative battery terminal. Where thereare two battery modules 116, the battery modules may be connected toeach other in parallel or in series and, where there are three or morebattery modules, the battery modules may be connected to each other inparallel or series or a combination of both.

The positive terminal busbar 122 interconnects the positive batteryterminal of at least one of the battery modules 116 with the positivebattery terminal 126 of the housing assembly 110. The positive terminalbusbar 122 is connected and secured to at least one of the positivebattery terminals of the battery modules 116 by one or more buttonscrews or by any other suitable joining method. The positive terminalbusbar 122 is connected and secured to the positive battery terminal 126by a button screw or any other suitable joining method. The positiveterminal busbar 122 instead may be any other suitable electricalconnector such as a cable, a bar or other suitable connector orcombination of any of the foregoing.

The terminal cable 120 interconnects the negative busbar 124 and thenegative battery terminal 128. The negative terminal busbar 124 includesa crimp connection 150 for engaging the terminal cable 120. The negativeterminal busbar 124 is connected and secured to at least one of thenegative battery terminals of the battery modules 116 by one or morebutton screws or any other suitable joining method. The terminal cable120 is flexible and may be comprised of copper or other suitable metalor material. The terminal cable 120 is shaped to extend into theextension 130. The terminal cable 120 terminates in an eyelet crimpconnector 162. The eyelet crimp connector 162 is connected and securedto the negative battery terminal 128 by a button screw, a washer, a lockwasher and a nut or by any other suitable joining method. The terminalcable 120 and the negative terminal busbar 124 each instead may be anyother suitable electrical connector such as a cable, a bar or othersuitable connector or combination of any of the foregoing.

The partition 118 is received by the receptacle 114 and is positionednext to the battery modules 116 to limit or eliminate movement of thebattery modules within the receptacle or for otherwise holding thebattery modules in place. The receiver 112 includes two pairs of opposedwalls 154 and 156 and engaging structure for engaging the partition 118.In the illustrated embodiment, for example, the engaging structuredefines a pair of opposed slots 164 on the opposed walls 154 forslidingly engaging the partition 118. The location of the slots 164depends upon the sizes of the battery modules 116 received within thereceptacle 114. The engaging structure may be in any other suitable formand, in accordance with other embodiments, provide alternative locationsfor the partition 118 for adjustable positioning the partition 118 atthe suitable location.

The extension 130 and the receiver 112 each have engaging structure toengage the extension and receiver in any suitable manner. In theillustrated embodiment, for example, the extension 130 includes engagingstructure in the form of an embossment 170 that extends along its innerside 172 and the receiver 112 includes engaging structure in the form ofan outer wall 168 that defines a slot 174 for slidingly engaging theembossment. The embossment 170 includes a pair of walls 176 that extendparallel at an outward angle from the inner side 172 of the extension130. The slot 174 has an open bottom end and is defined by two parallelwalls 178 that extend inward at an angle to facilitate the slidingengagement of the embossment 170 into the slot.

The inner side 172 of the extension 130 defines an aperture 180. The topsurface 182 of the extension 130 includes a wall 184 defining a cornernotch 186 and defines an aperture 190 within the notch for receiving thenegative battery terminal 128. The terminal cable 120 extends through anaperture 194 defined by the lid 132, and aperture 180 to the negativebattery terminal location where the eyelet crimp connector end ofterminal cable 120 is secured inside extension 130 to the negativebattery terminal 128 by a button screw, a washer, a lock washer and anut or by any other suitable joining method.

The receiver 112 may incorporate up to three hold-down brackets 165. Oneon each exposed side. They may be removable as illustrated on FIG. 5.The extension 130 may also incorporate a hold-down bracket 166 with awindow (not shown) above to secure the assembly within the vehicle. Thereceiver 112 may be secured to the vehicle in any other suitable mannerin accordance with other embodiments of the present disclosure.

The receiver 112, the partition 118, the extension 130, the lid 132, thehandle 134, the terminal lid 138 and the detachable hold-down bracket165 may be constructed of plastic or any other suitable material and mayhave any suitable configuration. The first and second electricalconnectors may be constructed of metal or any other suitable materialand may have any suitable configuration.

The distance between the positive battery terminal 126 and negativebattery terminal 128 of the housing assembly 110 depends upon thevehicle and the size of the battery the vehicle was designed toaccommodate. For example, the distance between positive and negativebattery terminals of a standard 11″ battery is about 8.5″. For example,if the vehicle was intended for use with such a standard 11″ battery,the distance between the positive and negative battery terminals 126 and128 of the housing assembly 110 would be about 8.5″. The housingassembly 110 can be used with battery modules 116 having a distancebetween the positive and negative terminals of the battery modules thatis less than the distance between the positive battery terminal 126 andthe negative battery terminal 128 of the housing assembly. By turningthe battery modules 180° in the receptacle, the polarity of terminals126 and 128 in the housing assembly 110 may be reversed.

With reference to FIGS. 7-10, the housing assembly 210 includes areceiver 212 that defines a receptacle 214 receiving a pair of batterymodules 216, one or more partitions 218, a first electrical connector inthe form of a positive terminal busbar 222, a second electricalconnector in the form of a negative terminal busbar 224 and terminalcable 220, a positive battery terminal 226, a negative battery terminal228, an extension 230 and a lid 232 that encloses the top of thereceptacle 214. The lid 232 defines an apertures 236 for receiving thepositive battery terminal 226. The lid 232 also may include a handle234. The lid 232 may also include a battery terminal lid 238 to enclosethe positive battery terminal 226.

The battery modules 216 may be of any suitable size configured to bereceived within the receptacle 214 and may instead be a single batterymodule or multiple battery modules. Each battery module 216 includes apositive battery terminal and a negative battery terminal. Where thereare two battery modules 216, the battery modules may be connected toeach other in parallel or in series and, where there are three or morebattery modules, the battery modules may be connected to each other inparallel or series or a combination of both.

The positive terminal busbar 222 interconnects the positive batteryterminal of at least one of the battery modules 216 with the positivebattery terminal 226 of the housing assembly 210. The positive terminalbusbar 222 is connected and secured to at least one of the positivebattery terminals of the battery modules 216 by one or more buttonscrews or by any other suitable joining method. The positive terminalbusbar 222 is connected and secured to the positive battery terminal 226by a button screw or any other suitable joining method. The positiveterminal busbar 222 instead may be any other suitable electricalconnector such as a cable, a bar or other suitable connector orcombination of any of the foregoing.

In the illustrated embodiment, for example, the terminal cable 220interconnects the negative busbar 224 and the negative battery terminal228. The negative terminal busbar 224 employs a crimp connection 250 forengaging the terminal cable 220. The negative terminal busbar 224 isconnected and secured to at least one of the negative battery terminalsof the battery modules 216 by one or more button screws or any othersuitable joining method. The terminal cable 220 is flexible and may becomprised of copper or other suitable metal or material. The terminalcable 220 is shaped to extend into the extension 230. The terminal cable220 terminates in an eyelet crimp connector 262. The eyelet crimpconnector is connected and secured to the negative battery terminal 228by a button screw, a washer, a lock washer and a nut or by any othersuitable joining method. The terminal cable 220 and the negativeterminal busbar 224 each instead may be any other suitable electricalconnector such as a cable, a bar or other suitable connector orcombination of any of the foregoing.

The partition 218 is received by the receptacle 214 and is positionednext to the battery modules 216 to limit or eliminate movement of thebattery modules within the receptacle or for otherwise holding thebattery modules in place. The receiver 212 includes two pairs of opposedwalls 254 and 256 and engaging structure for engaging the partition 218.In the illustrated embodiment, for example, the engaging structuredefines a pair of opposed slots 264 on the opposed walls 254 forslidingly engaging the partition 218. The location of the slots 264depends upon the sizes of the battery modules 216 received within thereceptacle 214. The engaging structure may be in any other suitable formand, in accordance with other embodiments, provide alternative locationsfor the partition 218 for adjustable positioning the partition 218 atthe suitable location.

The extension 230 and the receiver 212 each have engaging structure toengage the extension and receiver in any suitable manner. In theillustrated embodiment, for example, the extension 230 includes engagingstructure in the form of an embossment 270 that extends along its innerside 272 and the receiver 212 includes engaging structure in the form ofan outer wall 268 that defines a slot 274 for slidingly engaging theembossment. The embossment 270 includes a pair of walls 276 that extendparallel at an outward angle from the inner side 272 of the extension230. The slot 274 has an open bottom end and is defined by two parallelwalls 278 that extend inward at an angle to facilitate the slidingengagement of the embossment 270 into the slot.

The inner side 272 of the extension 230 defines an aperture 280. The topsurface 282 of the extension 230 includes a wall 284 defining a cornernotch 286 and defines an aperture 290 within the notch for receiving thenegative battery terminal 228. The terminal cable 220 extends through anaperture 292 defined by the lid 232, and aperture 280 to the negativebattery terminal location where the eyelet crimp connector end ofterminal cable 220 is secured inside extension 230 to the negativebattery terminal 228 by a button screw, a washer, a lock washer and anut or by any other suitable joining method.

The receiver 212 may incorporate up to three hold-down brackets 265. Oneon each exposed side. They may be removable. The extension 230 may alsoincorporate a hold-down bracket 266 with a window (not shown) above tosecure the assembly within the vehicle. The receiver 212 may be securedto the vehicle in any other suitable manner in accordance with otherembodiments of the present disclosure.

The receiver 212, the partition 218, the extension 230, the lid 232, thehandle 234, the terminal lid 238 and the detachable hold-down bracket265 may be constructed of plastic or any other suitable material and mayhave any suitable configuration. The first and second electricalconnectors may be constructed of metal or any other suitable materialand may have any suitable configuration.

The distance between the positive battery terminal 226 and negativebattery terminal 228 of the housing assembly 210 depends upon thevehicle and the size of the battery the vehicle was designed toaccommodate. For example, the distance between positive and negativebattery terminals of a standard 14″ battery is about 11.5″. For example,if the vehicle was intended for use with such a standard 14″ battery,the distance between the positive and negative battery terminals of thehousing assembly would be about 11.5″. The housing assembly 210 can beused with battery modules 216 having a distance between the positive andnegative terminals of the battery modules that is less than the distancebetween the positive battery terminal 226 and the negative batteryterminal 228 of the housing assembly. By turning the battery modules180° in the receptacle, the polarity of terminals 226 and 228 in thehousing assembly 210 may be reversed.

The present disclosure provides many benefits. For example, vehicles aretypically designed to accommodate specific size batteries (e.g., 8.2″,11″ or 14″) and therefore the size of batteries to be installed on suchvehicles is typically limited to the specific size. The battery assembly8, 108 or 208 comprising housing assembly 10, 110 or 210 of the presentdisclosure, however, enables smaller batteries (battery modules) to beused on such vehicles. The present disclosure, among other things,provides an efficient manner for using odd size batteries (batterymodules) on vehicles designed to use a specific standard battery size.References to standard battery size herein are intended to refer to thesize and dimensions of a commercially used battery as understood by oneof ordinary skill in the art. For example, such references are intendedto include battery sizes standardized by agreement by two or morebattery manufacturers or battery sizes of any other vehicle batterieshaving predetermined sizes and dimensions. Similarly, one of ordinaryskill in the art understands that references to “battery module” hereinare intended to refer to a single battery cell or to an assembly ofbattery cells configured in series, parallel or a combination of both.The battery cell or the assembly of battery cells comprising the batterymodule may or may not have a housing or enclosure.

While embodiments have been illustrated and described in the drawingsand foregoing description, such illustrations and descriptions areconsidered to be exemplary and not restrictive in character, it beingunderstood that only illustrative embodiments have been shown anddescribed and that all changes and modifications that come within thespirit of the disclosure are desired to be protected. The descriptionand figures are intended as illustrations of embodiments of thedisclosure, and are not intended to be construed as having or implyinglimitation of the disclosure to those embodiments. There is a pluralityof advantages of the present disclosure arising from various featuresset forth in the description. It will be noted that alternativeembodiments of the disclosure may not include all of the featuresdescribed yet still benefit from at least some of the advantages of suchfeatures. Those of ordinary skill in the art may readily devise theirown implementations of the disclosure and associated methods, withoutundue experimentation, that incorporate one or more of the features ofthe disclosure and fall within the spirit and scope of the presentdisclosure and the appended claims.

The invention claimed is:
 1. A battery assembly for a vehicle, thebattery assembly comprising: at least one battery module having a firstpositive battery terminal and a first negative battery terminal and adistance therebetween; and a housing assembly comprising: a receiverdefining a receptacle for receiving the battery module; an extensionengaged with the receiver; a second positive battery terminal and asecond negative battery terminal having a distance therebetween, thedistance between the second positive battery terminal and the secondnegative battery terminal is greater than the distance between the firstpositive battery terminal and the first negative battery terminal, oneof the second positive battery terminal or the second negative batteryterminal disposed on the extension; a first electrical connector forinterconnecting the first positive battery terminal and the secondpositive battery terminal; and a second electrical connector forinterconnecting the first negative battery terminal and the secondnegative battery terminal.
 2. The battery assembly of claim 1 whereinthe extension and receiver are engaged.
 3. The battery assembly of claim1 wherein the extension is slidably engaged with the receiver.
 4. Thebattery assembly of claim 3 wherein the receiver includes a wall havingan outside that defines a slot and the extension includes an embossmentslidingly receivable within the slot.
 5. The battery assembly of claim 3wherein the extension includes a wall having an outside that defines aslot and the receiver includes an embossment slidingly receivable withinthe slot.
 6. The battery assembly of claim 1 wherein the receivercomprises a lid for enclosing the receptacle, the lid defining anaperture for receiving the other of the second positive battery terminalor the second negative battery terminal.
 7. The battery assembly ofclaim 6 wherein the lid defines an aperture for receiving the first orsecond electrical connector.
 8. The battery assembly of claim 1 whereinthe extension defines an aperture for receiving said one of the secondpositive battery terminal or the second negative battery terminal. 9.The battery assembly of claim 8 wherein the extension defines anaperture for receiving the first or second electrical connector.
 10. Thebattery assembly of claim 1 wherein the distance between the secondpositive battery terminal and the second negative battery terminal issubstantially the same as the distance between a positive batteryterminal and a negative battery terminal of a standard battery.
 11. Thebattery assembly of claim 1 wherein the distance between the secondpositive battery terminal and the second negative battery terminal isapproximately 6″.
 12. The battery assembly of claim 1 wherein thedistance between the second positive battery terminal and the secondnegative battery terminal is approximately 8.5″.
 13. The batteryassembly of claim 1 wherein the distance between the second positivebattery terminal and the second negative battery terminal isapproximately 11.5″.
 14. The battery assembly of claim 1 wherein said atleast one battery module comprises a plurality of battery modulesconnected in parallel.
 15. The battery assembly of claim 1 wherein saidat least one battery module comprises a plurality of battery modulesconnected in series.
 16. The battery assembly of claim 1 wherein said atleast one battery module comprises at least four battery modules, two ofthe battery modules connected in series and the other two of the batterymodules connected in parallel.